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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google, Inc.
* Copyright (C) 2015-2016 Intel Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <cbmem.h>
#include <cpu/x86/smm.h>
#include <soc/iosf.h>
#include <soc/smm.h>
static size_t smm_region_size(void)
{
u32 smm_size;
smm_size = iosf_bunit_read(BUNIT_SMRRH) & 0xFFFF;
smm_size -= iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF;
smm_size = (smm_size + 1) << 20;
return smm_size;
}
void smm_region(void **start, size_t *size)
{
*start = (void *)((iosf_bunit_read(BUNIT_SMRRL) & 0xFFFF) << 20);
*size = smm_region_size();
}
/*
* Subregions within SMM
* +-------------------------+ BUNIT_SMRRH
* | External Stage Cache | SMM_RESERVED_SIZE
* +-------------------------+
* | code and data |
* | (TSEG) |
* +-------------------------+ BUNIT_SMRRL
*/
int smm_subregion(int sub, void **start, size_t *size)
{
uintptr_t sub_base;
void *sub_ptr;
size_t sub_size;
const size_t cache_size = CONFIG_SMM_RESERVED_SIZE;
smm_region(&sub_ptr, &sub_size);
sub_base = (uintptr_t)sub_ptr;
switch (sub) {
case SMM_SUBREGION_HANDLER:
/* Handler starts at the base of TSEG. */
sub_size -= cache_size;
break;
case SMM_SUBREGION_CACHE:
/* External cache is in the middle of TSEG. */
sub_base += sub_size - cache_size;
sub_size = cache_size;
break;
default:
return -1;
}
*start = (void *)sub_base;
*size = sub_size;
return 0;
}
void *cbmem_top(void)
{
char *smm_base;
size_t smm_size;
/*
* +-------------------------+ Top of RAM (aligned)
* | System Management Mode |
* | code and data | Length: CONFIG_TSEG_SIZE
* | (TSEG) |
* +-------------------------+ SMM base (aligned)
* | |
* | Chipset Reserved Memory | Length: Multiple of CONFIG_TSEG_SIZE
* | |
* +-------------------------+ top_of_ram (aligned)
* | |
* | CBMEM Root |
* | |
* +-------------------------+
* | |
* | FSP Reserved Memory |
* | |
* +-------------------------+
* | |
* | Various CBMEM Entries |
* | |
* +-------------------------+ top_of_stack (8 byte aligned)
* | |
* | stack (CBMEM Entry) |
* | |
* +-------------------------+
*/
smm_region((void **)&smm_base, &smm_size);
return (void *)smm_base;
}
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